搜索 - 科创

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在一些特定应用中，人们会用BJT管代替JFET管，制作出BJT管+运算放大器的前端放大电路。这种电路失去了高输入阻抗的特性，但噪声水平可以做到更低，特别是低频噪声会有显著改善。

上图中，左图是BJT管+运放组成的放大电路，右图才是JFET管+运放组成的电路。从应用上看，BJT管往往有更低的噪声和失调电压，但输入电阻往往远小于JFET管，对准确测量电压的要求往往不太能满足。

透镜控制就是最基本的恒流源，原机使用运放＋BJT管来控制大电流，普通运放输出小电流；这里使用OPA544代替原先的BJT，普通的部分使用±50mA的精密运放即可。

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